Watch "Elementary" season 3 episode 12 online live stream. Spoilers ahead!

Tonight's hit CBS series will feature the back story between Johnny Lee Miller's character Sherlock Holmes and Ophelia Lovibond's Kitty Winter.

"Elementary" season 3 episode 12 creator and executive producer Robert Doherty sat down with TV Fanatic where he shared detailed information on what will happen in tonight's episode.

"Over the course of the first 10 episodes, we have alluded to Sherlock and Kitty's first meeting in London but we've never really explored it," Doherty explained.

"We've never really explained the circumstances. So, in the next episode, as the hunt for the person who hurt Kitty heats up, we take time to go backwards and explore how it all began."

"There's a strong connection between the story we're telling in the present and the story we're telling in the past," he continued.

"We will understand why Sherlock was willing to help Kitty to the degree that he was. It seemed to us the best way to tell the story in that episode was to look back and give the audience the starting point so they can see the entire arc of the story."

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"Elementary" season 3 episode 12 online live stream is available on CBS at 9 pm EST.